Fix compilation warning.

Author: florent-lamiraux

include/sot/core/feature-pose.hxx

@@ -335,7 +335,7 @@ void FeaturePose<representation>::display(std::ostream &os) const {
         os << featureNames[i];
       }
     os << ") ";
-  } catch (ExceptionAbstract e) {
+  } catch (const ExceptionAbstract& e) {
     os << " selectSIN not set.";
   }
 }

src/feature/feature-1d.cpp

@@ -93,7 +93,7 @@ void Feature1D::display(std::ostream &os) const {
   try {
     os << "  error= " << errorSIN.accessCopy() << endl
        << "  J    = " << jacobianSIN.accessCopy() << endl;
-  } catch (ExceptionAbstract e) {
+  } catch (const ExceptionAbstract &e) {
     os << " All SIN not set.";
   }
 }

src/feature/feature-visual-point.cpp

@@ -167,14 +167,14 @@ void FeatureVisualPoint::display(std::ostream &os) const {
     const Flags &fl = selectionSIN.accessCopy();
     if (fl(0)) os << " x=" << xy(0);
     if (fl(1)) os << " y=" << xy(1);
-  } catch (ExceptionAbstract e) {
+  } catch (const ExceptionAbstract &e) {
     os << " XY or select not set.";
   }
 
   try {
     const double &z = ZSIN.accessCopy();
     os << " Z=" << z << " ";
-  } catch (ExceptionAbstract e) {
+  } catch (const ExceptionAbstract &e) {
     os << " Z not set.";
   }
 }

src/task/gain-hyperbolic.cpp

@@ -83,7 +83,7 @@ void GainHyperbolic::display(std::ostream &os) const {
   os << "Gain Hyperbolic " << getName();
   try {
     os << " = " << double(gainSOUT.accessCopy());
-  } catch (ExceptionSignal e) {
+  } catch (const ExceptionSignal &e) {
   }
   // os <<" ("<<coeff_a<<";"<<coeff_b<<";"<<coeff_c<<coeff_d<<") ";
   os << " (" << coeff_a << ".exp(-" << coeff_b << "(x-" << coeff_d << "))+"